SpaceX partnered up with NASA in order to launch 2 astronauts, Doug Hurley and Robert Behnken, to the International Space Station.
The Demo-2 mission involved launching the Crew Dragon spacecraft (and 2 astronauts inside) on a Falcon 9 rocket to the International Space Station.
Unfortunately, with just T minus 16 minutes until launch, the Crew Dragon launch was canceled, due to the weather conditions. Officials were unsure if precipitation was going to occur, which could affect the launch. Due to the unknowing weather conditions, the launch was scrubbed (called off).
The astronauts were not allowed to immediately leave right when the launch was scrubbed. The process of scrubbing involves making sure that it is safe for the astronauts to exit the spacecraft. One of the main features of the Crew Dragon spacecraft was its emergency exit system, which must be disabled before the astronauts leave to ensure it does not activate when they leave the spacecraft.
Although it was disappointing, the whole world watched a successful launch on May 30, 2020. The era of private space exploration has begun!